Marine Geodesy最新文献

{"title":"Spline retracker: a geometrical retracking algorithm for coastal and open ocean altimetry","authors":"Saleh Mafi, Saeed Farzaneh, Mohammad Ali Sharifi, Ehsan Forootan","doi":"10.1080/01490419.2023.2291772","DOIUrl":"https://doi.org/10.1080/01490419.2023.2291772","url":null,"abstract":"Satellite altimetry has enhanced the understanding of ocean dynamics through high-rate sampling and global coverage. However, land contamination and bad reflection effects limit its accuracy. We pr...","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139082284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coastal vulnerability assessment along the coast of Kerala, India, based on physical, geological, and socio-economic parameters","authors":"Saikrishnan K., Anand K.V., Agilan V.","doi":"10.1080/01490419.2023.2285944","DOIUrl":"https://doi.org/10.1080/01490419.2023.2285944","url":null,"abstract":"The increase in population and rapid economic development activities increase vulnerability along the coastal areas. Coastal zones are among the planet’s most dynamic regions and are susceptible to...","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138631432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of atmospheric corrections on shallow sea bathymetric mapping using gaofen-2 imagery: a case study in Lingyang Reef, South China Sea","authors":"Tianqi Lu, Yan Yu, Luyi Wang, Wei Chen, Caiying Ji, Xiang Tang, Changgao Shao","doi":"10.1080/01490419.2023.2284182","DOIUrl":"https://doi.org/10.1080/01490419.2023.2284182","url":null,"abstract":"Satellite-derived bathymetry (SDB) with high spatial resolution effectively maps detailed information about shallow sea depths. Properly selecting atmospheric correction (AC) methods is crucial to ...","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inversion Method for Instantaneous SSP Area Difference","authors":"Wenzhou Sun, Yuanxi Yang, Anmin Zeng","doi":"10.1080/01490419.2023.2285360","DOIUrl":"https://doi.org/10.1080/01490419.2023.2285360","url":null,"abstract":"Addressing the challenge of real-time estimation of instantaneous sound speed profiles (SSP for short). We proposes a SSP inversion method based on the travel time of vertically launched sound wave...","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detecting outliers in crowdsourced bathymetric data based on intelligently optimized 3D-DBSCAN algorithm","authors":"Shuaidong Jia, Hao Yuan, Lihua Zhang, Zhicheng Liang, Zhou Yinfei","doi":"10.1080/01490419.2023.2279086","DOIUrl":"https://doi.org/10.1080/01490419.2023.2279086","url":null,"abstract":"To address the problem of low quality of the outlier detection results caused by the irregular spatial distribution of crowdsourced bathymetric data, an intelligently optimized 3D-DBSCAN method is ...","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Global Sea Level Change Rate, Acceleration and Its Components from 1993 to 2016","authors":"Fengwei Wang, Yunzhong Shen, Qiujie Chen, Jianhua Chen, Jianhua Geng","doi":"10.1080/01490419.2023.2276478","DOIUrl":"https://doi.org/10.1080/01490419.2023.2276478","url":null,"abstract":"AbstractInvestigating the global sea level budget is essential to quantify the total sea level change (altimetry) and its components, including the steric sea level change and the ocean mass change (gravity), where the latter is mainly attributed to four mass-driven components (Greenland, Antarctica, glaciers and land water storage). In this study, a 24-year global ocean mass change is derived by the joint use of Tongji-LEO2021 and Tongji-Grace2018 monthly gravity field models over 1993–2016, with which the sea level budgets in terms of rate and acceleration are investigated over global oceans within the latitudes 66oN to 66oS together with the IGG-SLR-HYBRID gravity field models, altimetry, steric and four mass-driven components. The statistical results show that the global mean ocean mass change rate accounts for ∼54% of 2.85 ± 0.30 mm/year of global mean total sea level change. The accelerations of global mean total sea level change and its components are 0.145 ± 0.025 mm/year2 (altimetry), 0.003 ± 0.021 mm/year2 (steric), 0.139 ± 0.047 mm/year2 (ocean mass from Tongji), and 0.137 ± 0.010 mm/year2 (the sum of mass-driven components) respectively, indicating that the global sea level budget in terms of acceleration can be closed and nearly no acceleration exists in the global mean steric sea level change for the period 1993–2016.Keywords: Global sea level changeGravity field modelsAltimetryStericAcceleration Disclosure StatementNo potential conflict of interest was reported by the author(s).Data Availability StatementThe merged altimetry gridded global sea level height anomalies are accessed at https://doi.org/10.24381/cds.4c328c78. The two situ steric datasets (EN4 and IK09) are accessed at https://doi.org/10.4121/12764933.v3. The Tongji-LEO2021 and Tongji-Grace2018 models are free to access from the websites of http://icgem.gfz-potsdam.de/series/03_other/Tongji/Tongji-LEO2021 and http://icgem.gfz-potsdam.de/series/03_other/Tongji/Tongji-Grace2018, respectively. Four mass components (i.e. Greenland, Antarctica, glaciers and land water storage) are accessed from https://catalogue.ceda.ac.uk/uuid/17c2ce31784048de93996275ee976fff. Besides, the IMBIE 2018 Antarctic and IMBIE 2019 Greenland datasets can be directly downloaded from the website of http://imbie.org/data-downloads/.Additional informationFundingThe research is supported by the Natural Science Foundation of China [42061134010, 42192532, 41731069 and 42174099] and the National Key R&D Program of China [2021YFB3900101].","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135819421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Case-Based Reasoning Method for Generalizing Depth Contours considering Both Navigational Safety Assurance and Line Shape Preservation","authors":"Shuaidong Jia, Zikang Song, Lihua Zhang, Zhicheng Liang","doi":"10.1080/01490419.2023.2263907","DOIUrl":"https://doi.org/10.1080/01490419.2023.2263907","url":null,"abstract":"AbstractTo address the problem that the parameters are relatively fixed in the existing automatic methods of depth contour generalization, a case-based reasoning method for generalizing depth contours is proposed considering navigational safety and line shape. First, the structured description of depth contours before and after cartography generalization is made to form case samples. Then, driven by the training samples, the machine learning of BP neural network model is constructed, to obtain the simplification degree taking into consideration the preservation of contour shapes. Finally, the generalization parameters are flexibly adjusted based on the simplification degree obtained through the case-based reasoning, so that depth contours can be adaptively generalized for various complex situations. The experimental results demonstrate that: (1) The case-based reasoning method can make the generalization of depth contours comply with the principle of navigational safety; (2) The case-based reasoning method has a stronger applicability maintaining the shape of depth contour, and is more suitable for the automatic generalization of depth contours, compared with the rolling circle method and the triangulation method. Generally, the case-based reasoning method has the potential to improve cartographic quality meeting the requirements of IHO specification, supporting the automatic production of ENC and nautical chart product.Keywords: Chart generalizationdepth contour generalizationnavigational safety assuranceline shape preservationcase-based reasoning AcknowledgmentsWe would like to thank the editor and anonymous reviewers for their valuable suggestions. We have made some modifications according their suggestions.Disclosure statementNo potential conflict of interest was reported by the authors.This paper is supported by National Natural Science Foundation of China (41901320, 41871369).Additional informationFundingThis paper is supported by National Natural Science Foundation of China (41901320, 41871369).","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136033326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validation of the Total Suspended Matter (TSM) algorithm using in situ datasets over the Bay of Bengal Coastal Water","authors":"Bimalkumar Patel, Apurva Prajapati, R. Sarangi, Bhargav Devliya, Hitesh Patel","doi":"10.1080/01490419.2023.2249229","DOIUrl":"https://doi.org/10.1080/01490419.2023.2249229","url":null,"abstract":"Abstract TSM (Total suspended matter) is important metric because it influences ocean biogeochemistry and seaweed habitat. Light penetration is influenced by the TSM range, which is linked to primary producer photosynthesis. Many regional and global approaches for measuring various ocean parameters using satellite remote sensing have been developed. The authors developed the linear TSM algorithm in 2022 using in situ data from the Arabian Sea, which has been validated in this work utilising in situ sampling along the Bay of Bengal coast to test its resilience. The algorithm has the remote sensing reflectance band ratio Rrs681/Rrs490 that has been validated against in situ TSM (R2 = 0.88, MAD = 12.28, RMSE = 12.45, NRMSE = 11.60) and satellite validation with OLCI-A (Ocean and Land Colour Instrument-A). OLCI A TSM product discovered poor regression with in situ datasets, suggesting that the algorithm in OLCI A might be modified. The article infers that the validated TSM algorithm in the Bay of Bengal could be useful for different satellite-based synoptic TSM mapping for the Indian Oceansat-3 OCM (Ocean Colour Monitor) mission as TSM could benefit seaweeds and biogeochemistry by improving nutrient flow, trophic interactions, shielding against UV radiation, and adding organic carbon pool.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44232032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automatic Collision Avoidance Route Planning Method in Complex Navigation Environments","authors":"Yinfei Zho, Lihua Zhang, Shuaidong Jia, Zeyuan Dai, Junnan Liu","doi":"10.1080/01490419.2023.2241636","DOIUrl":"https://doi.org/10.1080/01490419.2023.2241636","url":null,"abstract":"Abstract Efficient collision avoidance (CA) route planning is one of the important technologies for ensuring the safety of autonomous ships. Many CA route planning studies have been developed for the open sea, but few studies have been conducted for ships in complex navigation environments. A complex navigation environment refers to water encompassing various factors, such as multiple obstacles, varying water depths, ships collision risk, and other maritime challenges. These factors collectively contribute to the complexity of the environment. CA planning in this type of environment is a special type of route planning. To address CA in complex navigation environments, firstly, the route binary tree algorithm is utilized for conducting global route planning in order to determine the optimal path. Secondly, this paper proposes a dynamic generation of local collision avoidance trajectories along the optimal path, seamlessly integrating global route optimization and local collision avoidance. Finally, a comparative analysis is conducted using classical techniques to verify the effectiveness of the proposed method. Numerical simulation results reveal that when a ship is taken as the object of CA in the open sea, the route generated using the proposed method exhibits a remarkable level of unity with the one generated by the benchmark method of improved Artificial Potential Field (APF), particularly in terms of collision avoidance strategy selection, collision avoidance trends, and the actual trajectory. The former’s computational efficiency is improved by at least 30%. When dealing with CA at sea, with complex navigation obstacles, the proposed method considers static complex navigation obstacles, dynamic ships, and their unpredictable strategies to timeously generate a safe path which considers some key rules from the COLREGS (International Regulations for Preventing Collisions at Sea) (IMO, 1972).","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47613952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calibration of the Instrumental Errors on Marine Gravity Recovery from SWOT Altimeter","authors":"Gang Ma, T. Jin, Pengyuan Jiang, Jiasheng Shi, Mao Zhou","doi":"10.1080/01490419.2023.2232107","DOIUrl":"https://doi.org/10.1080/01490419.2023.2232107","url":null,"abstract":"Abstract The wide-swath altimetry mission, Surface Water and Ocean Topography (SWOT), makes it possible to further break through the accuracy and resolution of marine gravity field recovery. However, as its main payload, the Ka-band radar interferometer (KaRIN) is easy to be affected by the spacecraft attitude, mechanical deformations and dual antenna signal reception status, which generates instrumental errors including roll errors, phase errors, baseline dilation errors, timing errors, and KaRIN noise. Together with ocean temporal variations, the instrumental errors have large effects on the SWOT Sea Surface Height (SSH) observations and hence the marine gravity field recovery. Here, taking the sea area around Japan as an example, we investigated the calibrations of instrumental errors and ocean temporal variations on the recovery of the marine gravity field. The SSH observations of SWOT are first simulated by Mean Sea Surface (MSS), Absolute Dynamic Topography (ADT), Mean Dynamic Topography (MDT) and instrumental errors. Next, the influence of instrumental errors on determining vertical deflection within single-cycle data was analyzed. Then, three calibration methods (KaRIN/KaRIN cross-calibration, Representative KaRIN/KaRIN cross-calibration, and KaRIN/Nadir cross-calibration) are used to reduce the instrumental errors; the experimental results show KaRIN/KaRIN cross-calibration is the optimal one. Last, for the multi-cycle observations containing ocean temporal variations, crossover calibration is done in single cycle and then followed by collinear adjustment in multi-cycles. This approach is verified by considering 18 simulated cycles that cover almost 1 year. Our result indicates an improvement in the accuracy of marine gravity anomaly by about 45% compared to that of one cycle. The calibration strategy of instrumental errors and ocean temporal variations can be used for high-precision marine gravity field recovery with abundant SWOT observations in the near future.","PeriodicalId":49884,"journal":{"name":"Marine Geodesy","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48910963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}